NPPES file of Aug 9, 2026

Kelli Lynn Sieczkowski, LCSW

Clinical Social Worker · Flagstaff, AZ

Kelli Lynn Sieczkowski, LCSW is a clinical social worker with a practice address in Flagstaff, Arizona, and NPI 1740459460, issued on Feb 27, 2008. Check the license (Arizona LCSW10655, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1740459460
Name
Kelli Lynn Sieczkowski
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License number
LCSW10655 AZ
Self-reported in NPPES; status is on the state search
Practice location
408 N Kendrick St, Flagstaff, AZ 86001
Phone
(928) 774-6364
Enumerated
Feb 27, 2008
Record last updated
Feb 27, 2008 (not updated in 18 years: call before relying on the address or phone)
Fax
(928) 556-0504
Medicare enrollment
Enrolled (PECOS I20101026000339); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical social worker records → All 3,200 in Arizona → Look up another NPI →

Also registered at 408 N Kendrick St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Patricia Burke, PHDCounseling Psychologist1992767446
  2. Lauren Canniff, PSYDClinical Psychologist1730598194
  3. Linzi Cody, LPC, PH.D.Psychologist1316349061
  4. Cristina Culhane, LCSWClinical Social Worker1619115359
  5. Justin Dallacqua, J.D., PSY.D.Psychologist1780059584
  6. Steven Finger, PH. D.Counseling Psychologist1639226160

Verify Kelli Lynn Sieczkowski in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Arizona board licenses this profession
    Search for license LCSW10655    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Arizona license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Kelli Sieczkowski PLLCMesa, AZ

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Kelli Lynn Sieczkowski among 3,200 clinical social worker records in Arizona

Kelli Lynn Sieczkowski, LCSW is one of 3,200 clinical social worker records with a practice address in Arizona. 11% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 23% of them.

  • NPI issued2008 · 23% of these records are older, 73% newer
  • In a Medicare fileYes · 11% of these records are
  • In the CMS Doctors and Clinicians fileYes · 20% of these records are
  • Graduated1998 · median 2011 among the 648 with a school on file
  • Record last updated2008 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

81 clinical social worker records list a practice address in Flagstaff

They are 81 of the 2,419 NPPES records with a practice address in Flagstaff, and 3,200 clinical social worker records in Arizona.

All 3,200 in Arizona → Every provider in Flagstaff → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Deborah Bennett, M.S.W.Flagstaff, AZ 860011720091093
  2. Susan Boness, MSWFlagstaff, AZ 860011326298134
  3. Sara Codner, MSSW, LCSWFlagstaff, AZ 860011831428259
  4. Cristina Culhane, LCSWFlagstaff, AZ 860011619115359
  5. Craig Davis, LCSWFlagstaff, AZ 860011225278930
  6. April Ely, LCSWFlagstaff, AZ 860011659642759
  7. Vickey Finger, MSWFlagstaff, AZ 860011518944701
  8. Lauren Fofanova, LCSWFlagstaff, AZ 860011164743613

Common questions

What is Kelli Lynn Sieczkowski, LCSW's NPI number?

Kelli Lynn Sieczkowski, LCSW's National Provider Identifier (NPI) is 1740459460, issued on Feb 27, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Kelli Lynn Sieczkowski, LCSW located?

The NPPES record lists a practice address at 408 N Kendrick St, Flagstaff, AZ, 86001. Phone: (928) 774-6364. Providers update this record themselves, so call before visiting.

How can I verify Kelli Lynn Sieczkowski, LCSW's license?

NPPES lists Arizona license number LCSW10655, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.